The effect of calcium source and particle size on the production performance and bone quality of laying hens
The effect of calcium source and particle size on the production performance and bone quality of laying hens
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DOI：
10.3382/ps.2008-00278
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发表时间：
2009-02-01
期刊：
影响因子：
4.4
通讯作者：
Anderson, D. M.
中科院分区：
文献类型：
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作者：
Saunders-Blades, J. L.;MacIsaac, J. L.;Anderson, D. M.
研究了 3 个当地石灰石源作为蛋鸡潜在钙源的功效。评估石灰石来源的体外溶解度。使用四种钙源（对照，A、B 或 C）和 2 种粒径组合（研磨，100% 研磨；或混合，67% 研磨 + 33% 大颗粒）。对照物由用于研磨钙源的商业研磨石灰石和作为大颗粒钙源的牡蛎壳组成。 DeKalb 蛋鸡被随机放置在 32 个笼式笼单元中（n = 12/笼）。 19 周龄时，母鸡接受 8 种钙源和粒径处理中的 1 次（4 次重复/处理），直至 74 周。整个过程中对产蛋量、饲料消耗量、体重和鸡蛋质量进行了测量。在铺设结束时评估骨矿物质密度（通过定量计算机断层扫描）、断裂强度、灰分和钙。体外溶解度取决于 Ca 源和粒度 (P < 0.0001)，牡蛎壳通常比相似粒度的测试石灰石源 A、B 和 C 具有更大的体外溶解度。饲喂不同钙源的母鸡的饲料消耗量（100 至 117 克/只每天）、体重（1,500 至 1,800 克）、产蛋量（92% 峰值产蛋量）、蛋重（55 至 67 克）和蛋比重（1.090 至 1.078）在饲喂不同钙源的母鸡之间没有差异（P > 0.05）。胫骨骨密度表明牡蛎壳处理的骨小梁密度低于钙源 A；然而，所有其他钙源的所有测量值都具有相似的骨矿物质密度（P > 0.05）。饲喂混合钙颗粒处理的母鸡在 27 至 70 周期间的饲料消耗始终高于饲喂 100% 研磨钙源的母鸡 (P < 0.05)。接受混合钙颗粒处理的母鸡的骨矿化得到增强（P < 0.05）。总体而言，本研究的结果表明，当地石灰石来源 A、B 和 C 将成为蛋鸡目前商业钙来源的合适替代品。此外，大颗粒钙确实改善了骨质量。
The efficacy of 3 local limestone sources as potential Ca sources for laying hens was studied. Limestone sources were assessed for in vitro solubility. Four Ca sources (control, A, B, or C) and 2 particle size combinations (ground, 100% ground; or mixed, 67% ground + 33% large particle) was used. The control consisted of a commercial ground limestone for the ground Ca source and oyster shell of the large particle Ca source. DeKalb laying hens were randomly placed in 32 battery cage units (n = 12/cage). At 19 wk of age, hens received 1 of 8 Ca source and particle size treatments (4 replicates/treatment) until 74 wk. Egg production, feed consumption, BW, and egg quality were measured throughout. Bone mineral density (by quantitative computed tomography), breaking strength, ash, and Ca were assessed at the end of lay. In vitro solubility was dependent upon Ca source and particle size (P < 0.0001) with oyster shell generally having a greater in vitro solubility than test limestone sources A, B, and C of similar particle sizes. Feed consumption (100 to 117 g/bird per day), BW (1,500 to 1,800 g), egg production (92% peak egg production), egg weight (55 to 67 g), and egg specific gravity (1.090 to 1.078) did not differ among hens fed the different Ca sources (P > 0.05). Tibia bone mineral density indicated the oyster shell treatment had a lower trabecular density than Ca source A; however, all other Ca sources had similar bone mineral density for all measures (P > 0.05). Hens fed the mixed Ca particle treatments consistently had greater feed consumption from 27 to 70 wk than those fed the 100% ground Ca source (P < 0.05). Bone mineralization was enhanced in hens that received the mixed Ca particle treatments (P < 0.05). Overall, the results of this study indicate that the local limestone sources A, B, and C would be suitable alternatives to current commercial sources of Ca for laying hens. In addition, large particle Ca did improve bone quality.